Lighting dimmer using thyristor AC power

Published:2011/8/28 21:58:00 Author:Jessie | Keyword: Lighting dimmer, thyristor, AC power | From:SeekIC

This circuit can continuously adjust lamp's brightness which below 3kW. The choosen Bi-directional thyristor can bear 1200V, so the circuit power can be supplied by 220V or 380V grid, the latter output power can reach 4.4 kW. Trigger circuit dc power is supplied by rectifier bridge BY179. When switch S is closed, trigger capacitor C5 is charging. When the recharging voltage is over BRY39's gate voltage, the pipe is connected, C5 is discharged, so transformer output pulse supplys for the thyristor. Changing the potentiometer R2 can adjust the brightness of the light.



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